121010220 has 96 divisors (see below), whose sum is σ = 378302400. Its totient is φ = 32113152.

The previous prime is 121010207. The next prime is 121010257. The reversal of 121010220 is 22010121.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149176 + ... + 149984.

It is an arithmetic number, because the mean of its divisors is an integer number (3940650).

Almost surely, 2^121010220 is an apocalyptic number.

121010220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121010220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189151200).

121010220 is an abundant number, since it is smaller than the sum of its proper divisors (257292180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121010220 is a wasteful number, since it uses less digits than its factorization.

121010220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104 (or 1096 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 121010220 is about 11000.4645356458. The cubic root of 121010220 is about 494.6226692809.

Adding to 121010220 its reverse (22010121), we get a palindrome (143020341).

Subtracting from 121010220 its reverse (22010121), we obtain a palindrome (99000099).

The spelling of 121010220 in words is "one hundred twenty-one million, ten thousand, two hundred twenty".